Updated mediawiki/extensions
Project: mediawiki/extensions/EventLogging  f789be2f692dec58319392b9999a4a9bfc453bcd
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Update module declaration example

- Use 'SignUp' rather than 'Person' (more realistic).
- Specify revision ID.

Change-Id: I285a26bdf22f140f3d1537535a7d650d38f7ba25